feat: initial commit

backend/app/models.py

@@ -0,0 +1,42 @@
+from datetime import datetime, timezone
+from sqlalchemy import Column, Integer, String, Float, ForeignKey, DateTime, Text
+from sqlalchemy.orm import relationship
+from .database import Base
+
+
+class Category(Base):
+    __tablename__ = "categories"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, unique=True, nullable=False)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+    piggy_banks = relationship("PiggyBank", back_populates="category")
+
+
+class PiggyBank(Base):
+    __tablename__ = "piggy_banks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, nullable=False)
+    target_amount = Column(Float, nullable=False)
+    current_amount = Column(Float, default=0.0, nullable=False)
+    currency = Column(String, default="USD", nullable=False)
+    category_id = Column(Integer, ForeignKey("categories.id"), nullable=True)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
+
+    category = relationship("Category", back_populates="piggy_banks")
+    transactions = relationship("Transaction", back_populates="piggy_bank", cascade="all, delete-orphan")
+
+
+class Transaction(Base):
+    __tablename__ = "transactions"
+
+    id = Column(Integer, primary_key=True, index=True)
+    piggy_bank_id = Column(Integer, ForeignKey("piggy_banks.id"), nullable=False)
+    amount = Column(Float, nullable=False)
+    description = Column(Text, nullable=True)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+    piggy_bank = relationship("PiggyBank", back_populates="transactions")